/Engine/Plugins/Runtime/Metasound/Source/MetasoundEditor/Public/MetasoundEditorGraph.h
[UMetasoundEditorGraphVariable](API\Plugins\MetasoundEditor\UMetasoundEditorGraphVariable) * FindOrAddVariable ( const [Metasound::Frontend::FConstVariableHandle](API\Plugins\MetasoundFrontend\FConstVariableHandle) & InVariableHandle )